From fac227f609e544f8f55aca8447b4328d6534407a Mon Sep 17 00:00:00 2001
From: Simon Hausmann <simon.hausmann@nokia.com>
Date: Thu, 17 Jun 2010 07:43:41 +0200
Subject: Speed up calls to QPainter::setCompositionMode when the mode is
 unchanged

Avoid marking the composition mode as dirty and calling into the
extended engine if the composition mode that the application wants to
set is the same that's currently used.

Reviewed-by: Gunnar
---
 src/gui/painting/qpainter.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/gui/painting/qpainter.cpp b/src/gui/painting/qpainter.cpp
index d17c711..71bc990 100644
--- a/src/gui/painting/qpainter.cpp
+++ b/src/gui/painting/qpainter.cpp
@@ -2391,6 +2391,8 @@ void QPainter::setCompositionMode(CompositionMode mode)
         qWarning("QPainter::setCompositionMode: Painter not active");
         return;
     }
+    if (d->state->composition_mode == mode)
+        return;
     if (d->extended) {
         d->state->composition_mode = mode;
         d->extended->compositionModeChanged();
-- 
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